Fring is a cool service, Fring on the iPhone is below zero kelvin! I just installed it -thanks to mikew41- and Fring is ral real cool. To give you an idea on what it can do

1. import jabber / gtalk friends and chat with them via Jabber
2. import friends from other Instant Messaging service and use the service. I do not use these but think MSN, Y!, ICQ etc
3. setup your twitter account and have a multitasking twitter client in the background (keyword: background)
4. Import Skype contact, sign in and USE skype over Wifi!
5. Setup SIP and use your iPhone to make real VOIP calls over wifi over the internet

As you can see, a switch army knife. Skype by itself would have been cool enough for me, SIP a great much needed add on. But this is an application that communicates with all services I use and acts as the information hub between my twitter, my XS4ALL VOIP, my Skype and my jabber friends. I think it it the best application available on the iPhone. Installation is a 10 seconds job once you are in "installer" (you do have a jailbroken phone I hope?). Simpley ad the repository to installer, tab on fring and you are ready! This is great.

Some time ago I blogged about the excellent Skype Blackhat presentation. Now you can read on Heise how Skype bypasses NAT and firewall, something that is rather trickey with open standards VOIP protocols.

How Skype get round firewalls

But anyone who has used the popular internet telephony software Skype knows that it works as smoothly behind a NAT firewall as it does if the PC is connected directly to the internet. The reason for this is that the inventors of Skype and similar software have come up with a solution.

Skype Hacked! Skype Made Mobile!

It’s true. The rumors have been confirmed. Skype is going mobile! But not in quite the way you might have expected it! Skype has been hacked. Officially.

See the "proof" video on the skypejournal.

Hacking Exposed VoIP Voice over IP Security Secrets and Solutions by David Endler and Mark Collier.

Here you can donload the security tools mentioned in the book. I have some books from this serie and think I might buy this one as well.

Though most of the reviews on Amazon are not positive. El Reg has some notes on it as well. (Yes I know that the picture isnt the right one for the cover of the book, but I could find the right one)

Nadat de beste provider van Nederland, wellicht de wereld, gratis VOIP telefoons nummers aanbood, nu gratis dialout gedurende de zomer.

Van 7 juli t/m 31 augustus kunnen alle XS4ALL abonnees via hun XS4ALL VoIP Out account gratis bellen naar populaire vakantiebestemmingen en naar alle vaste telefoonnummers binnen Nederland. Voor VoIP Out betaalt u geen extra abonnementskosten; het is gewoon inbegrepen bij uw huidige abonnement. U betaalt slechts voor de gesprekken die u voert. En nu veel gesprekken gratis zijn, kunt u flink besparen op uw telefoniekosten.

Dank je XS!